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Numerical model of a cross-flow heat exchanger with non-uniform flow of media

100%

Hanuszkiewicz-Drapala M. , Bury T. , Widziewicz K.

Journal of Power Technologies

2013

tom Vol. 93, nr 5

295--302

This paper presents thermal-hydraulic analyses of finned cross flow heat exchangers working in media flow maldistribution conditions. The authors postulate a possibility of performing such analyses through the use of CFD models of recurrent segments of the heat exchangers. Media inflow to each recurrent segment may be individually defined and thus the flow maldistribution in the whole heat exchanger could be considered. The methodology of creating these models, running calculations and results of very initial experimental validation is presented in the paper.

Selected studies of flow maldistribution in a minichannel plate heat exchanger

80%

Dąbrowski P. , Klugmann M. , Mikielewicz D.

Archives of Thermodynamics

2017

tom Vol. 38, no. 3

135--148

Analysis of the state of-the-art in research of minichannel heat exchangers, especially on the topic of flow maldistribution in multiple channels, has been accomplished. Studies on minichannel plate heat exchanger with 51 parallel minichannels with four hydraulic diameters, i.e., 461 μm, 574 μm, 667 μm, and 750 μm have been presented. Flow at the instance of filling the microchannel with water at low flow rates has been visualized. The pressure drop characteristics for single minichannel plate have been presented along with the channels blockage, which occurred in several cases. The impact of the mass flow rate and channels’ cross-section dimensions on the flow maldistribution were illustrated.